English name Finger Clap
This is from the Kata Koto Ryu Ninjutsu Koppo Jutsu Shoden no kata
This is from the Ryu Ha Koto Ryu Ninjutsu
Shihaku (Finger Clap)
Kuden - This technique means to capture the Ukes rythem. What is important here is to deceive the Uke into thinking that you are going to kick.
Both you and the Uke begin in Seigan no Kamae (right hand forwards). The Uke attacks with a left Fudo Ken to your face. Step back 45 degrees to the left with the left foot and receive the attack with a right Uke Nagashi. The Uke then attacks with a right Fudo Ken to your face. Step back 45 degrees to the right with the right foot and receive the attack with a left Uke Nagashi - sink low and pull your hips back. Then, bring your right leg up powerfully to make the Uke beleive that you are going to kick him, then change and move forwards dropping down with the right foot and strike powerfully to the Ukes Suigetsu with a right Fudo Ken (strike at a 45 degree angle down). Then return to Seigan no Kamae and Zanshin.
The densho says that your final punch is a double punch. This does not mean that you punch at the same time, rather the punches come in one after the other, and with explosive power.
It is wise to keep an army for a thousand years to use but once.